Electric switch



Aug. 16, 1927.V 1,638,905

l l c. AALBORG ELECTRIC SWITCH Filed o ct. ,725. 1921 yTN ESSESI PatentedrAug. 16, 1927.

UNITED -sTATEsPATENT OFFICE,v

CHRISTIAN AALBCRG, or rITTsBURCII, PENNSYLVANIA, AssIGNoR To WEsTING- IIoUsE ELECTRIC j& MANUEaCTURING COMPANY, A CORPORATION or PENNSYL- VANIA.

ELECTRIC SWITCH.-

Application'led October 25, 1921. Serial No. 510,351.

My invent-ion relates to electric switches and particularly to those of the push-button type.

M f invention has' tor its object theprovision of a switch ot the push-button type that shall be otl simple and compact forni and which may be conveniently installed and operated.

My switch is particularly adapted for use in Connection with the testing of wattmeters and is shown as designed for completing a circuitthrough a pair of main conductors ot a polyphase circuit and two voltage conductors of a wattmeter although it may be employed in permanent installations,

As shown in the accompanying drawing,

Figure 1 is a view of my switch, in longitudinal section, showing the position of the parts when the circuit is interrupted.

Fig. 2 is a rView showing the movable parts of the switch in closed position, and

Fig. 3 is a view tak-en on the line III- III o-t'Fig. 1. y y

The switch comprises a. casing member 4, ot tubular form, that is closed at its one end by a plug member 5'through which two pairs of conductors 6 and 7 extend, only one of the conductors 7 being shown. At its other end, the casing 4 is provided with a cap member 8through which a plunger 9 extends. A block 1()n ot insulating material, is secured in the casing by a pair otscrews 11. kThe block 10 is provided with four grooves extending longitudinally thereof and o1PA such depth that they may accommodate the terminal members, hereinafter described., in spaced relation to the inner wall of the tubular casing 4.

The ends of the conductors 6 are secured to a pair ot terminal blocks14 and 15"'by means oit screws 16 and 17, respectively, and the conductors 7 are secured to terminal blocks 18 and 19 by means of screws 2O and 21. respectively.

The terminal blocks 14 and 1 5` at their outer ends, together with screws `23 and 24, serve to clamp a pair of contact fingers 25 and 26` respectively, into grooves of the block 10, and the terminal blocks 18 and 19,

in like manner, maintain the contact lingers 27 in place in the other pair of grooves.

The block 10 is provided with a recess in which one end of a compression spring 28 is seated. The other end of the spring 28 txt/cds into a recess that is centrally located in the inner end of the plungerA 9. The spring thus serves to normally maintain the shouldered end 3() ofthe plunger in engagement withthe .flanged portion 31 of the cap'member 8, as shown-in Fig. 1,. YThe lenlarged end portion y of the vplunger 9 is provided With four grooves in its periphery similar to those in the terminal blocks 10. Two of these grooves are provided with contact plates 33 and 34 that are secured in place by means of a rivet or pin member 35 that extends through the plunger 9. The contact plates 33 and 34, together with the pin 35, constitute a bridging member for the lingers 25 and 26.

The other two grooves in the plunger 9 are each provided with a contact plate 37, and these contact plates are connected by a pin 38 that extends through the plunger 9. The plates 37 and pin 38 constitute another bridging member. The fingers 25 and 26 extend into the grooves whichcarry the contact plates 33 and 34 and are bridged by such plates and the pin 35 whenever the plunger is depressed. The contactfingers Q'hhave sliding engagementwith the other pair of grooves and are bridged by the plates 37 and the pin 38 when the plunger 9 is depressed.

It will be seen from the foregoing that. whenever the plunger 9 is depressed against the spring Q8, the circuit through the4 conconductors 6 is completed, as is also the circuit of the conductors 7 The cap member 8 is provided with an Y vided with an enlarged portion 42 of small- 2 er diameter than the plug 40. so that it may be placed in the assembled position, through the opening before the plug is inserted. The` plunger 9'is provided with a recess in which a compression spring 44 and a bal] 45 are carried and, when the plunger is depressed, the ball 45 will be forced, by the spring 44, into ak recess 46 of the cap member 8, thus locking the plunger 9 in depressed, or closed. positionv andiholding the circuit closed. The push button 41 maxvv be depressed to force the ball`45 out of engagement with the shoulder 46 and thus permit the switch to be moved to open position, by the spring 28.

From the foregoing, it will be observed that the switch may be quickly and eonveniently operated and it is of Simple design. l

It desired, the switch may be employed as an interrupter for a single circuit instead of si plurality of circuits. and various other changes may be made therein Without dearting from the spirit of the invention as defined in the accompanying claim.

I claim as my invention:

In an electric switch, the combination With an insulating terminal-supporting block provided7 at its opposite sides, with 15 stationary contact members, of an insulating 'plunger provided, at its opposite sides, with a pair otmovable contact members in alinement With the said stationary contact meinbers and adapted to cri-operate therewith, a spring disposed between and engaging the adjacent ends of the block and plunger? anl n conducting member extending through the plunger andinsulated from the said spring for securing the vmovable Contact members to the plunger.

In testimony whereof, I have hereunto subscribed my naine this 21st day of 0ctober, 1921.

oHRisTiAN AALBORG. 

